Call Apple. Customer Service should be able to change your card without messing up your order. Do NOT try to do that yourself on the web page - THAT will mess you up!!!!11/17-11/24. Freaking a, I had to change the payment method to my discover card to pay the tax. Those extra few minutes cost me. The worst part—just got the order confirmation from Apple, they still used the original card on file!!! I need them to use my discover card but am afraid that editing my payment method would push back my delivery.